F9 means
problem with the oven door lock circuit. If the door is locked, it's probably a bad switch that tells the oven it's locked. If the door isn't locked, probably a problem with the lock mechanism.
A common problem on many built-in ovens (you don't say if yours is built-in or free standing...) is air circulation in the control panel. The fan that keeps the panel cool either stops working or gets clogged with dirt/dust and can't move any air. This causes the panel to overheat and can cause all kinds of odd problems and error codes. If you have a built-in, check to make sure the fan is working and the mesh screen behind it is clean
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